A warning is issued to ships in the southern Pacific after more than 100 iceberg were spotted drifting towards New Zealand.
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President Obama is to pledge to cut greenhouse gas emissions in several stages, including 42% by 2030, officials say.
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Astronomers have devised a web-based game that could help work out the basis of galactic collisions.
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Cutting emissions to mitigate climate change will also make people healthier, according to research.
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Ministers back calls to plant millions of trees across the country to help combat climate change.
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A gene known to shield the body from harmful chemicals may also protect against bowel cancer, a study suggests.
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This year will be in the top five warmest years globally since records began, according to the UK Met Office.
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Households which recycle could get up to £130 a year in shopping vouchers under the Tories, says George Osborne.
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Climate is a major driver of conflict across Africa, researchers say, with future warming likely to increase civil wars by 50% in 20 years.
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Greater access to anti-retroviral drugs has helped cut the deaths from HIV by 10% over the past five years, latest figures show.
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